/Engine/Source/Runtime/InteractiveToolsFramework/Public/TargetInterfaces/MaterialProvider.h
TODO: We may decide that we want some functions to query whether the object allows one or the other, or we may break this out into a separate interface. We'll wait to see when this actually becomes necessary to see the most convenient way to go at that point.
true if successful
bool CommitMaterialSetUpdate ( const [FComponentMaterialSet](API\Runtime\InteractiveToolsFramework\TargetInterfaces\FComponentMaterialSet) & MaterialSet, bool bApplyToAsset )